Boiler



w. F. GRO'SCUP.

BOILER.

APPLICATION Fll ED NOV. 4, 1920- 1 %16,26 PatentedMay 16, 1922.

4 SHEETS-SHEET 1..

W. F. GROSCUP.. BOILER.

APPLICATION man NOV. 4. 1920.

Patented May HEETS -SHEET 2.

w. F. GROSCUP.

BOILER.

APPLICATION FILED NOV- 4, 1920. 1A1fi286.

Patented May 16, 1922 4 SHEETS-SHEET a.

a t a W w. asaosp'up.

BOILER.

APPLICATION FILED NOVA, 1920.

Patented May16,1922.

4 SHEETS-SHEET 4.

STTQES BOILER.

' Application filed November To all wlaomcit may consent:

Be it known that 1, WI LIAM F. Gnosonr, a citizen of the United States, and resident of Baltimore city and State of Maryland, have invented new and useful Improvements in Boilers, of which the following is a specification. I

The object of the invent-ion is to provide an efficient circulation and heat exchange.

To this end the invention comprises a boiler in which the water shall attain its circulation from a fire-box which first receives the water, the main part passing into a water-back at one side of the boiler, thence through 'a series of double heating tubes arranged in vertical series above the fire-b 2;, receiving the water from the water-back and discharging thereinto. A separate pipe takes a part of the waterfrom the fire-box space and carries it up above the first set of heating tubes into a supplemental heating tube and thence into a, water-back so that the two bodies of water may mix and the heated bodies of Water flow into an upper series of tubes and then discharge into the water-back at one side, and, finally discharge from the top of the water-back above the upper tubes and at the opposite side of the boiler the comingled bodies of Water, as set forth in the appended claims.

The invention consists .of certain novel features of construction and combination of parts which will be hereinafter described and pointed out in the claims.

In the accompanying drawings:

Figure 1, is a view in front elevation of the invention;

Figure 2, is'a view in rear elevation;

Figure 3, is a view in front elevation with the front of the furnace or boiler removed showing the relation of the firepot, water back, spurtubes; and bafiies;

I Figure 4 is a vertical sectional .view on the line 4--1 of Figure 3;

Figure 5 is a horizontal sectional view on the line 5 50f Figure 3; z a

Figure 6, is an enlarged detail View in vertical section showing the method of connecting the water back and fire pot together;

The front wall 1 of the furnace and the rear wall 2 are connected together by a plurality of rods 3, 3, having nuts 4; screwed on the ends thereof for securely holding the walls together. The side walls 5, 5. are preferably made up in sections which sections I Specification of Letters Yatent.

Pa'tcntedliiay 16, M522.

4, 1920. Serial No. 421,797.

have an off set'portion 4 which overlaps the loweredge of the adjacent section, the'rods 8 connecting the front and rear walls together engaging the off set portions f the sections of the walls for affording the necessary support to maintain the various sections in their proper relation.

The firepot 7 is constructed of wrought iron or steel having the inner surface thereof corrugated for the purpose ofincreasing the heating surface. The firepot is preferably made U-shaped and hollow, the edges or joints in the formation of the firepot of wrought iron or steel being preferably welded together. An opening 8 is formed in the front of the firepot for the removal of clinkers. The main waterback 9 is constructed of wrought iron or steel and is connected to the u shaped ends of the firepot by means of tapered stud nipples 10, 10, welded to the firepot, there being shown only-two at each end of the firepot, though the number may be increased or diminished as desired. The walls of the firepot and waterback are held together to insure the stud nipples to be tightly and securely fitted in the tapered openings by meansof bolts 11 welded to the firepot and passing through sleeves 12 extending through the two walls of the waterback. The stud nipples are tapered and adapted tofit tapered openings in the waterhack and as the bolts 11 are tightened by the nuts thereon the firepot is drawn tightly against the front wall of the firepot, thereby insuring the nipples being properly seated in the openings of the firepot. The sleeves 12 prevent the collapsing of the walls of the waterback.

Ba flles 13, 13, areconnected at their inner edges to the waterback 9 bymeans of tapered stud nipples 14-, bolts 15. and sleeves 16, in the same manner as the firepot is connected to the w'aterback. The opposite ends of the baflies are connected by suitable piping 17 to the forward end of the firepot 7. Water inletpipe 18 admits water to the lower end of the waterback 9 and it passes through the nipples 10 into the firepot where it is heated, passing from the water space of the firepot through the upper nipples 10, to the waterback 9. and also passing through the pipes 17 and baffles 13 back to the waterbaclr 9 near the upper end thereof. The battles are relatively thin and extend practically across the rear side of the furnace,

there being sufficient space allowed between the inner edges of the baflies to insure the obtaining of a direct draught but the baflles project sufficiently far toward the front of the boiler as to cause the smoke and heated gases to be deflected from their natu ral course which is toward the waterback and back of the furnace, toward the front of the furnace and thence over the top of the bafties to be discharged through the smoke flue 19 at the rear of the furnace.

I refer to these parts 13 as baffles, but these baffles and their connecting part together may be termed a supplemental. heating tube because of their function as a whole. It should beobserved that this supple mental heating tube 13 receives and discharges the water with considerable force by reasonof the increased. area of the part adjoining. the pipe 17 and the increased area of the part'adjoining the water-back, the two parts of the larger area lying. at the opposite ends of the constricted central part.

Therefore the water passing through the supplemental heating tube 13 passes in a constant stream. through the nipple .1 1 joining the upwardly flowing mass of water and preventing any entry therefrom into the tube The water coming from the tube 13 is of substantially the same temperature as that rising in the water-back, and the coiningled bodies finally pass through the perforations in the ends of the upper inner tubes 21 and thence through the outer pipes 20 to the water-back, receiving the final complement of heatbefore being discharged from the water-back into the pipe 29.

Connected to the waterback are a plurality of spur tubes These tubes are each constructed of an outer tube 20 and an inner tube 21, as shown in Figure 1. The outer ends of the inner tubes 20, 21 are integrally welded together so that the ends are closed. The inner end of the outer tube 20 being tapered or beveled on its outer surface and adapted to be seated in a tapered opening 23 in the front wall of the waterback 9. The inner end of the inner tube 21 is provided with a screw threaded shank 24 and on each is screwed a tapered .nut 25. The nut 25 .is provided with a tapered inner end which is adapted to fit a tapered opening in the rear wall of the waterback 9, and by screwing the nut 25 on the shank 24s the outer tube 20 is securely seated in the front wall of the waterback and the nut 25 will become seated in the rear wall of the back 9 so that a tight joint is produced.

The inner tube 21 is provided with an elongated slot 27 preferably located on the lower side thereof and at the inner or inlet end of the tube. A similar opening 26 is formed atthe outer or outlet end of the tube 21 but this opening or slot 26 is located at right angles or at ninety degrees to the openthrough the tube and discharged through i the opening 26 thereof intothe outertube 20 and caused to come in contact with the heated walls of the tube 20; The waterwill become heated due to contact with the heated walls of the tube 20 and return to the waterback thereby producing a positive circulation and eliminating. flashing. The openings 26 and 27 of the tube 21 are each of a size equal to the inside area of the tube 21. Surrounding each of the inner tubes 21 at their inner ends and, located between the front and rear walls of the waterback 9' are slotted sleeves 28L These sleeves permit of the water entering and discharging from the I pipes 21 and 20 and afford the necessary support for the two walls of the water back to prevent collapsing or buckling dueto heat and the tightening or seating of the tubes in the wall of the waterback.

Between the sides 5 of the furnace struc-c ture and the sides ofthe fire-box the space is filled with asbestos: as indicated at 315 and betweenthe back wall of thefurnace and-the water-back an asbestos backing is also introd-uced as indicated at 32. v a

The water on entering the main water wall or back 9 through pipe-18 will pass into the firepot through the ,nippleslO and when it becomes heatedwill return to the circulating chamber of the main water back through nipples 10. The efliciency of the firepot -7 is further increased by connecting two pipes 17 in the front end thereofpwhereby the heated water will be delivered to the water baffles 13, causing the heated wateror steam globules to pass into the waterba-ck and then. to the dome or main outlet pipe 29. The nipples 10 can not deliver all of the water admitted to the waterback to the firepot and therefore some of the water will be deflected upwardly the waterba-ck where it will be caused to enter the inner tubes; 21 of the spur tubes andw'ill pass throughthese tubes and. be discharged at their outer ends into the outer circulating tubes 20, These outer tubes 20 being directly exposed to the heat of the products of combustion will transmit the heat to the water so that when the water is again delivered to thewater-back it is in a heated condition and willseek the outlet 29. In this way it will be seen that all of the water is preheated before entering the more directly heated surfaces and the circulation is in this way forced by expansion thereby greatly increasing the efficiency of the boiler. The staggering of the spur. tubes and. corrugating of the, inner surfaces of the firepot together with the positioning of the baflics as described creates a complete combination making the boiler adaptable for all grades of fuel and increasing the eiliciency of the boiler very materially.

By this apparatus I provide for the upward movement of the water and the. best application of the heat of the furnacethereto. Idivide the body of" water entering the fire pot sending a large portion thereof into the water back through the opening 10 and the other part of the pipe 17. The water in the water-back first enters the inner tube of each water-tube 20 and then discharges at the opposite end into the outer tube, thereby securing an economical application of the heat to each tube in turn. The heated water constantly rises in successive stages until it nearly reaches the top of the water-back. In the meantime the portion of the water pass ing up the pipe 17 at the opposite side discharges into the thin walled supplemental heating tube 13 in which the high heating efl'ect produced brings it as near as possible to the temperature of the water previously heated. These two bodies of water thus comingled now enter; the upper series of tubes 20 passing first through the inner tubes 21 and then out through the surrounding or lower tube and into the water-back, the whole body then entering the discharge pipe 29 and then through the boiler to discharge on the other side at the top.

The spiders and the nuts 28 and 25 operate to the best advantage. They surround the water-back ends of the two series of tubes. The inner tube being securedto the outer tube and passing through the outer wall of the water back enables me to apply end nut 25 so as to take up the threaded end 24: of the inner tube and thus draw both tubes toward the respective walls of the water back. It should be observed especially that there is no partition in the Water-back, and, in short, everything is subordinate to the upward circulation of the whole body of water to provide for the division of water and to then complete the uniform and successive heating before discharging.

This apparatus is capable of being used with a hot water heater, or for steam or vapor heating systems, but of course when employed as. a steam or vapor heating system the water level in the boiler will be about midway of the upper spur tube.

However, in constructing the firepot, waterback and battles of wrought iron or steel it is possible to utilize a much thinner wall and at the same time produce a Water space sufficiently thin as to obtain a very thin film of water thereby utilizing all of the heating units of the products of combustion and causing the water to become heated much more readily than with a large water space of a cast iron construction. The water on entering the firepot will become heated as it is in a very thin film and as it is delivered to the baffles 13 which have a very thin water space causes the water to be practically if not generated into steam before leaving the battles. Furthermore with a wrough iron construction the fitting of the spur tubes and battles to the connections between the firepot and waterback can be accomplished by simply forming openings therein and. each nipple and tube can be forced on their seats in the openings'forming a metal to metal joint and thereby eliminating the use of packing in making the joint.

Having fully described my invention what I claim as new and desire to obtain by Letters Patent is: v

1. In a heater, the combination of a water fire-box, a water-back, a series of tubes re ceiving water from the water-back and discharging into the water-back, a pipe leading from the side of the water-fire-box opposite to the water-back, and a supplemental fiattened heating tube at the top receiving water from the pipe and discharging into the water-back.

2. In a heater, a water fire-box, disposed at the bottom of the heater, a water-back at one side of the heater, means for delivering water to the fire-box, the firebox being provided with an opening for discharging a part of the water from the fire-box to the water-back, spur tubes leading from the water-back to heat a part of the water and supplemental heating means leading from the opposite side of the fire-box and receiving a part of the water from the fire box and discharging that water into the water-back with means for further heating the combined mass of water.

3. In a heater, the combination with a water-fire-box, of a water-back, a series of spur tubes connected with the water-back and lying above the firebox, a supplemental pipe lying in the space above the fire-box, and receiving water therefrom flattened heating tubes receiving water "from the supplemental pipe and discharging into the water-back, a series of tubes receiving the coinmingled water from the water-back and discharging it thereinto and means for finaL ly discharging the commingled mass.

4. In a heater, the combination of a waterback, having an outer wall and an inner wall, a series of spur tubes leading from the water-back and discharging thereinto, and comprising substantially concentric inner and outer tubes, spiders adapted to separate the walls of the water-back and each surrounding the points where each outer tube and each inner tube is connected with the water-back, and means for securing the spiders and the spur tubes to the water-back.

5. In a heater, the combination of an outer tube having an inner tube secured at one end connected with the inner wall of the waterback and comprising outer and inner tubes connected at one end, spiders surrounding the point of connection of the'spur tubes with the water-back, means passing through the outer wall of the water-back and into the space surrounded by the spiders to engage the inner tube and to draw the outer tube in engagement with the water-back, the

spiders serving to space the walls of the I water-back and to prevent their collapse.

WILLIAM F. GROSGUP. 

